This model shows how natural selection affects bacteria, and therefore, affects the population and health of humans. The natural selection of bacteria and bacterial evolution creates a profound effect on the human population. This is so because as humans develop more antibiotics to kill off bacteria, genetic differences in bacteria cause the bacteria to become resistant to certain antibiotics. Thus, humans need to improve and develop new antibiotics to kill off the bacteria.
In this model, by pressing the antibiotics button, a new antibiotics will be "released" into the simulation. This will cause some of the bacteria to be killed off and the human population (brown shapes) to grow. By pressing the evolve button, a new form of bacteria that has grown resistant to the antibiotics released earlier will appear. This new bacteria will once again take over until a new antibiotic has been released.
The example that is modeled in this simulation is based on the four principals of natural selection, because once the bacteria evolves, only more of the same colored bacteria can be produced, which demonstrates the last three principals. The first principal is demonstrated by the color of the bacteria. This change in color is meant to demonstrate the evolution of the bacteria genetically.
Bacteria evolution is the accurate description of the phenomenon. Bacteria evolution is where bacteria that once were quelled by a particular type of antibiotic drug become "resistant" to the drug over time. The first time ht drug is use, most of the bacteria are killed, bu some of them can survive, if they have a gene of genes that allow them to withstand the drug's effects somewhat. The ones that survive are better adapted to deal with that particular type of antibiotic drug. If the survivors are able to reproduce inside the person's body, then the next generation of bacteria is better suited to deal with the antibiotic as well.
Although, the model accurately depicts bacteria evolution accurately, there are still limitations. For example, due to time constraint, the model is not as full developed as it can be. The model can only show the effects of releasing antibiotics twice, and the bacteria modeled in the simulation can only evolve once. Any more presses on the buttons would give inaccurate results.
Links to research:
https://www.windows2universe.org/cool_stuff/tour_evolution_9.html
https://www.khanacademy.org/test-prep/mcat/biomolecules/evolution-population-dynmaics/a/evolution-natural-selection-and-human-selection
https://www.nature.com/subjects/bacterial-evolution